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Definition of "Vacuum Tube" |
An electron tube evacuated such that its electrical characteristics are essentially unaffected by the presence of residual gas. [Types of Vacuum Tubes, part of the radar dictionary]. / A vacuum tube is a device sometimes used to amplify electronic signals. In most applications, the vacuum tube is obsolete, having been replaced decades ago by the bipolar transistor and, more recently, by the field-effect transistor . / Always on/Dynamic ISDN is a networking application that uses the ISDN D-channel X-25 packet service to maintain an always on connection between an ISDN end-user and an information service provider. / electron tube evacuated to such a degree that its electrical characteristics are essentially unaffected by the presence of residual gas or vapor. Have been essentially replaced by transistors for amplification and rectification. Cathode ray tubes are still used as display devices. |
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